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Abstract:

Messages are transmitted from a computer sending device to a first main
server. The first main server splits the message into a plurality of
message parts and the plurality of message parts is transmitted to a
plurality of parallel file servers. The message parts are stored in the
file servers or are transmitted to a second main server. The second main
server triggers the transmission of the plurality of message parts to the
second main server and the second main server recombines the plurality of
message parts to a complete message. The message is then transmitted from
the second main server to the computer receiving device. The message
transfer and the message part transfer are encrypted processes.

Claims:

1. A computing system comprising a computer sending device; a first main
server connected to the computer sending device; a plurality of file
servers disposed in parallel and each connected to the first main server;
a second main server connected to the plurality of file servers; a
computer receiving device connected to the second main server; wherein a
message is sent from the computer sending device to the first main
server; wherein the message is split in the first main server into a
plurality of message parts; wherein the plurality of message parts is
sent from the first main server to the plurality of file servers; wherein
the plurality of message parts is sent from the plurality of file servers
to the second main server; wherein the plurality of message parts is
recombined in the second main server to the message; wherein the message
is sent from the second main server to the computer receiving device.

2. The computing system according to claim 1 wherein wherein an encrypted
message is sent from the computer sending device to the first main
server; wherein the message is split in the first main server into a
plurality of encrypted message parts; wherein the plurality of encrypted
message parts is sent from the first main server to the plurality of file
servers; wherein the plurality of encrypted message parts is sent from
the plurality of file servers to the second main server; wherein the
plurality of encrypted message parts is recombined in the second main
server to the message; wherein the encrypted message is sent from the
second main server to the computer receiving device.

3. The computing system according to claim 1 further comprising a first
databank associated with the first main server; and a second databank
associated with the second main server.

4. The computing system according to claim 3, wherein the message is
first analyzed; wherein information about message attributes is read;
wherein the state of the system is analyzed in the file servers in
parallel; wherein the actual load of the file servers is determined;
wherein each of the message parts is encrypted by the system with the aid
of the AES encrypting method; wherein a random sequence of characters is
employed as a key with a length of 256 Bit; wherein the information or
attributes relating to individual message parts are stored in the first
data bank of the first main server; wherein the encrypted message parts
are sent onto the respective data holding file server; wherein the
message parts are stored on the respective data holding file server.

5. The computing system according to claim 3, wherein the receiver user
calls the second main server for joining of the message parts to obtain a
complete message; wherein the second main server calls the first main
server about required information which was stored in the first main
server; wherein the second main server calls all message parts of the
message from the data holding servers in the scope of the joining
process; wherein the message is sent to the user receiver after the
successful reunification.

6. A method of securely sending, storing and receiving messages
comprising inputting a message into a computer emitting device;
delivering the message to a first main server; transforming the message
into a plurality of message parts in the first main server; transmitting
the plurality of message parts from the first main server to a plurality
of file servers; storing the plurality of message parts on the plurality
of file servers; transmitting the plurality of message parts from the
plurality of file servers to the second main server; transforming the
plurality of message parts into the message in the second main server;
delivering the message from the second main server to the computer
receiving device.

7. The method according to claim 6 further comprising encrypting the
delivery of the message from the computer emitting device to the first
main server; encrypting the transmitting of the plurality of message
parts from the first main server to the plurality of file servers;
encrypting the transmitting of the plurality of message parts from the
plurality of file servers to the second main server; encrypting the
delivery of the message from the second main computer to the computer
receiving device.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a system and a method for the
secure emission/receiving of messages and the server based storage of
messages/data, wherein a participant can send messages/data to a server,
such that they are stored in a special way and kind on the server.

[0003] 2. Brief Description of the Background of the Invention Including
Prior Art

[0004] In connection with the storing of sensitive data, for example
patient and deadline data, it is important that third parties cannot
obtain access to these data. Frequently however, the data have to be
stored on a server as an external service provider in order to exploit
scaling advantages during the storage, to reduce the administrative
expenditure or to be able to access the data from arbitrary locations. It
is frequently necessary to work with the most different computer systems
in order to have worldwide access to the data. Here it is not possible to
assume that a system supports certain hardware components or that
software can be installed. Frequently, a web browser is the smallest
common denominator for a data exchange between a client computer and a
server.

[0005] The encrypted storage of data is common and widespread. Usually
symmetrical encrypted algorithms such as for example AES are here
employed. However, special software or special drivers, the presence of
which cannot be assured everywhere, are required for the storage of data
integrated with an operating system. The secure exchange of data is also
widespread and is for example employed in the S/MIME method for the
sending of encrypted e-mails. Asymmetric encrypting algorithms such as
for example RSA are employed here. In this manner data can be exchanged
between parties such that third parties cannot access these data.

[0006] The SSL method is the most widespread method to encrypt data, which
are transmitted through the Internet. The server and sometimes also the
client are authenticated through a public key infrastructure, and the
data are encrypted during transmission with standardized algorithms. In
this way the data cannot be changed or listened in by third parties. Only
the transmission path to the server is secured with this method. The data
are present on the server itself without encryption. This situation is
insufficient for many security requirements.

[0007] Where data have to be stored securely on a server and have to be
exchanged securely through the server, it has to be assured that the data
are transmitted only encrypted to the server, that the data are deposited
encrypted there, and are decrypted only on the clients connected to the
server. Third parties which have access to the transmission path or to
the server, cannot read the data. The keys, with which the data to be
exchanged are encrypted, are stored at the clients in local persistent
memories as applied in the methods and systems known in the state of the
art. This is disadvantageous, since for example web browsers frequently
will not have any local storage for keys, where one could access such
keys out of a browser application.

[0008] There exist already programs, which split files. These programs are
furnished to be applied for local use and which do not contribute to the
protection or, respectively, to the security of the data to be split.
Examples of this situation are the following applications:
www.hjsplit.org, www.gdgsoft.com/gsplit/. These are not applications,
which are based on a server. These programs are furnished for a local
installation that is on the computer of the respective user. These
applications split large files into several smaller files. The generated
files after the splitting are still on the computer of the user. The file
parts are not encrypted by these programs.

[0009] The user needs in turn an additional encryption program for
encrypting the file parts. Furthermore, an additional e-mail program is
required for mailing data to a receiver. The receiver needs after the
receipt of the data file parts the same program in order to lead the data
file parts again to a complete data file. There exists the danger that
the data file after the mailing are located at one location, which is the
mail server, and that unauthorized third persons can take possession of
the data file.

SUMMARY OF THE INVENTION

1. Purposes of the Invention

[0010] It is therefore an object of the present invention to enable a
secure server based storage and a secure server based exchange of
messages/data, without that keys for encrypting and decrypting of data
have to be stored locally in a persistent memory storage on a client
machine.

[0011] It is another object of the invention to improve the security of
the inter-human electronic communication, which contains the sending, the
receiving, and the storing of data.

2. Brief Description of the Invention

[0012] A computer system comprises a computer sending device connected to
a first main server, which is in turn connected to a plurality of file
servers disposed in parallel. The file servers are connected to a second
main server and the second main server is connected to a computer
receiving device. Messages are transmitted from the computer sending
device through the first main server, the parallel file servers, the
second main server to the computer receiving device.

[0013] The first main computer splits the message signal into a plurality
of message part signals, which each are recorded by a corresponding file
server. The message part signals are delivered from the plurality of file
servers to the second main server, where the message part signals are
again recombined to the message signal. The second main server delivers
the message signal to the computer receiving device. All transmissions of
the message signal and of the message the plurality of message parts is
stored on the plurality of file servers, wherein the plurality of message
parts is transmitted from the plurality of file servers to the second
main server, wherein the plurality of message parts is transmitted into
the message in the second main server followed by delivering the message
from the second main server to the computer receiving device.

BRIEF DESCRIPTION OF THE DRAWING

[0014]FIG. 1 is a view of a schematic diagram of a secure transmission
and storage system,

[0016]FIG. 3 is a view of a signal M1 delivered from a user U1 to the
first main server MS1,

[0017] FIG. 4 is a view of the first main server MS1 delivering message
parts to a plurality of file servers FS1 to FS-n,

[0018] FIG. 5 is a view of the file servers delivering message parts from
the file servers FS1 to FS-n,

[0019]FIG. 6 is a schematic view of the message M1 delivered for
receiving,

[0020] FIG. 7 is a schematic diagram of the message M1 being transmitted
from a second main server MS2,

[0021]FIG. 8 is a flow diagram of steps performed by the first main
server MS1,

[0022]FIG. 9 is a flow diagram of steps performed by the second main
server MS2,

[0023] FIG. 10 is a flow diagram of steps for establishing the number of
the plurality of message parts to be used.

DESCRIPTION OF INVENTION AND PREFERRED EMBODIMENT

[0024] A secure storage and communication system is furnished. A message
and/or data signal is emitted by a computer sending device U1 and the
emitted signals are fed UC1 to a first main server MS1. The first main
server conditions the message or data signal into a number of part
signals ISC1 to ISC-n, which part signals are fed into a number of
separate computers operating as file servers FS1 to FS-n and storing the
part signals ISC1 to ISC-n delivered by the first main server MS1. The
file servers FS1 to FS-n store the corresponding part signals ISC1 to
ISC-n. A second main server MS2 calls the part signals OSC1 to OSC-n from
the file servers FS1 to FS-n. The second main server MS2 joins the part
signals OSC1 to OSC-n together and feeds the joined signal through the
SSL encrypted connection UC2 to a receiver U2.

[0025] A data/message input U1 is an input computer or telephone furnished
with data/messages. The input computer is operating on an operating
system and is connected to the Internet through an Internet browser.

[0026] The input data/messages entered into the input computer are
furnished to an input data connection UC1. The data input connection UC1
is an SSL encrypted Internet connection. A second end of the data input
connection UC1 is connected to a first main server MS1. The first main
server MS1 is a computer, which subdivides the data message delivered
through the data input connection UC1 into a number of n separate first
message parts. Such a first main server MS1 is placed in a computer
center and is connected to the Internet. The Internet connection should
have a speed of minimum 100 Mbit. No peripherals are needed by the first
main server MS1, since it can be controlled from another computer through
a network. This first main server can have the following configuration:
processor minimum four cores and minimum 2 GHz, RAM storage minimum 4 GB,
hard disk minimum 10 GB. The required software on the first main server
can be the following:

[0027] operating system OpenSuse Linux at least
version 11.4

[0028] PHP at least the version 5.2, with integrated
modules: CLI, mhash, mcrypt web server Apache at least in the version 2

[0029] OpenSSL

[0030] data base MySQL at least in the version 5.0

[0031]
Java Oracle at least in the version 1.6

[0032] A first self developed program is responsible for the subdivision
or splitting of files and which stores the message parts.

[0033] In a process step 100, the first main server MS1 gets information
about attributes of a message. These attributes of the message are
transferred to a step 102 and information 104 about the state of the
system are transferred to the step 102, which fixes or sets the
conditions for splitting the message M1. The messages are split in the
step 106 following to the step 102. The message parts are encrypted in
step 108 following to step 106. Information about attributes of split
parts is obtained in step 110. Then in the following step 112, where the
message parts are sent to the storage file servers by an encrypted
connection. The junction 116 receives information about the attributes of
the message in step 100 and receives information about attributes of
split message parts in step 110 and delivers the information to step 114,
which saves the information about attributes of messages and split
message parts.

[0034] The first main server MS1 is connected to a plurality of n feeding
connections ISC1 to ISC-n, which are secured by SSL. The first main
server MS1 delivers n signals to respective feeding connections ISC1 to
ISC-n Each of the feeding connections ISC1 to ISC-n is connected to a
separate data holding file server FS1 to FS-n, where n is a number 4 or
larger.

[0035] The data holding servers FS1 to FS-n store the corresponding n
message part signals. A triggering signal from a second main server MS2
is delivered to the data holding servers FS1 to FS-n to deliver n part
signals to the discharging connections OSC1 to OSC-n. The discharging
connections OSC1 to OSC-n deliver the n part signals to a second main
computer server MS2, where the n message part signals are rejoined to
form the message or data signal. The second main server MS2 is a
computer, which joins the data delivered through the discharging
connections OSC1 to OSC-n into the data or message signal. Such a second
main server MS2 is placed in a computer center and is connected to the
Internet. The Internet connection should have a speed of minimum 100
Mbit. No peripherals are needed by the second main server MS2, since it
can be controlled from another computer through a network.

[0036] The receiver user U2 sends a request for receiving a message
through an encrypted connection to the second main server MS2. The second
main server MS2 includes a joining server, which gets information about
attributes of message and split message parts.

[0037] The receiver user U2 sends a request message reception through an
encrypted connection to the joining server to provide a step 136 getting
information about the attributes of message and split message parts. Then
a reading request of message parts is sent to the storage file server by
an encrypted connection in a step 138. Then a checking is performed if
the concerned message part exists in the file servers FS1 to FS-n in a
step 140. If not then an error message is sent to the user U2 in step
142. If the step 140 shows that the message part exists then the received
message part is decrypted in a step 144. The decrypted parts are joined
in a following step 146. The joined decrypted message parts are then sent
as a message to the user in step 148.

[0038] This second main server MS2 can have the following configuration:
processor minimum four cores and minimum 2 GHz, RAM storage minimum 4 GB,
hard disk minimum 10 GB. The required software on the

[0039] second main
server can be the following:

[0040] operating system OpenSuse Linux at
least version 11.4

[0041] PHP at least the version 5.2, with integrated
modules: CLI, mhash, mcrypt web server Apache at least in the version 2

[0042] OpenSSL

[0043] data base MySQL at least in the version 5.0

[0044]
Java Oracle at least in the version 1.6

[0045] A second self developed program, which is responsible for the
joining of the storage of the message parts and for the combining of
previously separated parts of files.

[0046] The message or data signal is delivered to the output connection
UC2, which is an Internet connection encrypted by SSL. The output
connection delivers the message or data signal to a receiver computer U2.

[0047] The invention can be applied in all areas, both private as well as
commercial, where the security of the electronically sent out information
is important. A conceivable application can be a company internal
communication, for example in a law office, a medical establishment, a
hospital, and insurance company and the like, that is always there where
important and sensible data are sent through the Internet and are stored
on a server, which is connected to be Internet and which is therefore
freely accessible for possible attackers.

[0048] In the following the components employed in the invention are
described in more detail.

[0056] File servers, which hold the parts of the subdivided messages/data,
are so-called data holding servers. Such a data holding server is a
computer, which is placed in a computer center and which is connected to
the Internet. The connection should have at least 100 MBit speed. This
computer does not need any peripheral apparatus, since the computer can
be served by another computer through the net work by an administrator.
This file server can have the following configuration, processor minimum
four cores and at least 2 GHz, RAM storage minimum 4 GB, hard disk
minimum 10 GB. The required software on this server can be as follows:

[0057] operating system OpenSuse Linux at least version 11.4

[0058] Java Oracle at least version 1.6

[0059] OpenSSL

[0060] Apache Solr, serves for indexing the messages and for searching the
message content in the messages

[0061] A third self developed program, which is responsible for the
administration of the storage of the parts of a message generated by the
first main server MS1.

[0062] MS1

[0063] The first main server, which subdivides sent messages/data and in
the following distributes the sent messages/data onto the so-called data
holding servers FS1 to FS-n.

[0064] Such a server MS1 is a computer, which is placed in a computer
center and which is connected to the Internet. The connection should have
a speed of at least 100 MBit. This computer does not require any
peripheral apparatus, since the computer can be operated from another
computer by an administrator through a network. This server can have the
following configuration: processor minimum four cores and minimum 2 GHz,
RAM storage minimum 4 GB, hard disk minimum 10 GB. The required software
on the server can be the following:

[0065] operating system OpenSuse Linux at least version 11.4

[0066] PHP at least the version 5.2, with integrated modules: CLI, mhash,
mcrypt web server Apache at least in the version 2

[0067] OpenSSL

[0068] data base MySQL at least in the version 5.0

[0069] Java Oracle at least in the version 1.6

[0070] A first self developed program, which is responsible for the
subdivision, the storage of the message parts.

[0071] MS2

[0072] The second main server, which combines the message parts/data from
the data holding servers and in the following transmits the combined
message parts/data coming from the so-called data holding servers. At the
call of the message parts/data, they are called from the data holding
file servers into the second main server for reconnecting them again in
the second main server and for transmitting this message to the user
receiver thereupon. Such a main server is a computer, which is placed in
a computer center and which is connected to the Internet. The connection
should have a speed of at least 100 MBit. This computer does not require
any peripheral apparatus, since the computer can be operated from another
computer by an administrator through a network. This main server can have
the following configuration: processor minimum four cores and minimum 2
GHz, RAM storage minimum 4 GB, hard disk minimum 10 GB. The required
software

[0073] on the server can be the following:

[0074] operating system OpenSuse Linux at least version 11.4

[0075] PHP at least the version 5.2, with integrated modules: CLI, mhash,
mcrypt web server Apache at least in the version 2

[0076] OpenSSL

[0077] data base MySQL at least in the version 5.0

[0078] Java Oracle at least in the version 1.6

[0079] A second self developed program, which is responsible for the
transfer and joining of the message parts and for delivery of the
messages to the user receiver.

[0080] UC1

[0081] data connection between the user (here sender) and the first main
server. This connection is an Internet connection secured by SSL

[0082] UC2

[0083] data connection between the user (here receiver) and the second
main server. This connection is an Internet connection secured by SSL.

[0084] ISC1 to ISC-n

[0085] data connection secured by SSL between the first main server and
the data holding servers, which are responsible for the holding of the
parts of the subdivided message/data, in a number of at least 4 to n.

[0086] OSC1 to OSCn

[0087] data connection secured by SSL between the second main server and
the data holding servers, which are responsible for the holding of the
parts of the subdivided message/data, in a number of at least 4 to n.

[0088] Process steps of the splitting, storing and recombination

[0089] P1

[0090] This process involves the sending process of a message/data. It
includes the process/data exchange between the user (sender) and the
first main server. The message M1 is transferred from the sender U1 in
the frame of a sending process P1 over an SSL secured data connection UC
to the first main server MS1. This is an Internet connection, which is
secured by SSL.

[0091] P2

[0092] A splitting or subdivision process and the distribution of the data
message parts through the first main server onto the data holding
servers. The first main server MS1 is responsible for the splitting of
the messages and receives the message to be subdivided within the
framework of the process P1. The message is first analyzed within the
frame of the process P2, that is information about the message attributes
are read. The state of the physical system is analyzed in parallel, that
is the number of data holding servers FS1 to FS-n and their actual load
are determined. These data are encrypted and are stored in a first
databank of the first main server MS1. In the following the subdivision
rules of the message are fixedly written. The message is subdivided into
parts according to previously fixed rules. Each of the message parts is
encrypted by the system with the aid of the AES encrypting method by
employing in each case its own key. A random sequence of characters is
employed as a key with a length of 256 Bit. The first main server
analyzes the message M1 within the frame of the process P2 and the first
main server MS1 decrypts the message depending on the result of the
analysis, subdivides the message in n parts (M1.1, M1.2, M1.3, M1.4) and
encrypts the individual parts again. After the subdivision process, the n
parts of the message are transferred onto the data holding servers FS1 to
FS-n through an SSL secured data connection ISC1 to ISC-n and are stored
there. This is an Internet connection, which is secured by SSL. Thereupon
the information/attributes relating to the individual message

[0093] parts are stored in the first data bank of the first main server
MS1. According to the rules fixed in the preceding step, the encrypted
message parts are sent in the next step onto the data holding server and
are stored there.

[0094] P3

[0095] Performing a calling of the data message parts from the data
holding servers FS-1 to FS-n onto a second main server MS2 and joining of
these message parts to a complete message again in the second main server
MS2.

[0096] A user U2 requests the call of a message within the scope of the
process P4.

[0097] A corresponding inquiry is sent to the second main server MS2
through an SSL-secured connection UC2. The second main server MS2, which
is responsible for the joining of all message parts to a readable
complete message, calls initially all required information about the
requested message, which were stored in the first data bank of the first
main server M1 within the scope of the subdivision process P2.

[0098] During the request/call of the message/data M1 from the receiver,
the second main server MS2 within the frame of the process P3 all
required message parts (M1.1, M1.2, M1.3, M1.4) of a message from the
data holding servers FS1 to FS-n through a SSL secured connection OSC1 to
OSC-n and join the message parts again together to a readable
message/data M1. This is an Internet connection, which is secured by SSL.

[0099] The second main server MS2 calls all message parts of a message
from the data holding plurality of file servers FS1 to FS-n in the scope
of the joining process P3 through a SSL secured connection OSC1 to OSC-n
with the aid of this information (In the case of an error, that is the
lacking of one or several message parts, the second main server M2 sends
a corresponding communication to the user U2). In each case all message
parts of a message are decoded in the next step in order to be again
united in the following to a complete readable message. After the
successful reunification this message is sent to the user U2 through an
SSL secured connection.

[0100] P4

[0101] The second main server MS2 then sends the joined message/data M1 to
the receiver U2 through the SSL secured data connection UC2 within the
frame of the calling process P3. This is an Internet connection, which is
secured by SSL.

[0102] Perform a calling process of a message/data. Furnish process/data
exchange between the user (receiver) and the second main server MS2.

[0103] Secure server based sending and storage of messages/data.

[0104] A server based system, comprising the processes P3 and P4 for the
secure storage of messages/data includes at least one or several main
servers MS1, MS2 and at least 4 or several data holding servers FS1 to
FS-n. The messages/data are transmitted by the sender U1 within the frame
of the sending process P1 to the first main server MS1 over a data
connection UC1 secured by SSL. The first main server MS1 analyzes the
message/data and encrypts the message depending on the result of the
analysis, subdivides the message in n parts and encrypts again the
individual parts. The n parts of the message are transferred and stored
in the data holding servers FS1 to FS-n after the subdivision process
through an SSL secured data connection ISC1 to ISC-n. Upon a request/call
of the expected message/data by the receiver U2, the second main server
MS2 calls all required message parts of a message from the data holding
servers FS1 to FS-n through an SSL secured connection OSC1 to OSC-n) and
joins the message parts again together to a readable message/data. The
second main server MS2 sends the joined message/data in the following the
receiver U2 within the frame of the calling process P2 over the SSL
secured data connection UC2.

[0105] Function of the setting for the splitting or subdivision of the
message/data The splitting functionality is installed on the first main
server and is responsible for the sending, the dividing, distributing of
the message parts on the data holding servers. The rejoining
functionality is installed on the second main server and is responsible
for the receiving the message parts from the data holding servers and for
the rejoining of the message parts to a full message.

[0106] After the splitting of the message and the encrypting of the
message parts and the following distribution of the message parts on the
data holding servers, the reading of the data by unauthorized third
parties is made difficult or, respectively, rendered impossible, that
only where all message parts are present, are decrypted and are led
together with the aid of the second main server, then the data are
readable again. One or several message parts do not allow any conclusions
relative to the contents of or other information about this message,
since the message cannot be led together.

[0107] The number of the parts of a message depends on the number of the
data holding servers FS1 to FS-n and on the side of the message Smsg
itself.

[0108] The number of the message parts is always by one smaller than the
number of the data holding servers Fs and depends on the parameter
"Smin", which defines the size of a message part.

[0109] The parameter Smin can be given/can be changed by the administrator
of the system. This parameter describes the size of a message part of a
message. Since there can be always messages, which have a size Smsg,
which is smaller than the parameter Smin, there has to be a solution for
this case. All messages, which are smaller than the value of the
parameter Smin are subdivided into two parts.

[0110] The Smsg message is established in step 160 and is delivered to
step 162, where the size of a mail message Smsg is established. The
condition step 164 receives the mail message Smsg from step 162 and the
value of minimum size of division block from settings Smin in step 166
and decides if Smsg is larger than Smin. If Smsg is smaller than Smin,
then the condition step 164 is false and step 168 shows the Number of
Division N=2. If Smsg is larger than Smin and step 164 is true, then the
parts division is rounded up to a whole number by dividing the size of
the Smsg by the minimum value of the block in step 170. The Number of
division N=FLOOR (Smsg/Smin). The condition step 172 receives input from
the step 170 and the number of the file servers FS in step 174. The
condition that N is larger than Sf-1 can be false and then the Number of
division is N in step 176. When the condition that N is larger than Sf-1
is true, then the Number of division is Sf-1 in step 178.

EXAMPLES

Example 1

[0111] (Size of the message) Smsg: 1124 kB

[0112] (size of the message parts) Smin: 100 kB

[0113] (number of the data holding servers) Fs: 6

[0114] Smsg 1124 kB/Smin 100 kB N=12 (possible message parts)

[0115] Fs-1=5

[0116] N>5

[0117] This message is subdivided into 5 parts.

Example 2

[0118] (Size of the message) Smsg: 90 kB

[0119] (size of the message parts) Smin: 100 kB

[0120] (number of the data holding servers) Fs: 6

[0121] Smsg 90 kB<Smin 100 kB

[0122] This message is subdivided into 2 parts.

Example 3

[0123] (Size of the message) Smsg: 324 kB

[0124] (size of the message parts) Smin: 100 kB

[0125] (number of the data holding servers) Fs: 6

[0126] SMSG 1124 kB/Smin 100 kB→N=4 (possible message parts)

[0127] Fs-1=5

[0128] N<5

[0129] This message is subdivided into 4 parts.

Example 4

[0130] (Size of the message) Smsg: 324 kB

[0131] (size of the message parts) Smin: 50 kB

[0132] (number of the data holding servers) Fs: 16

[0133] Smsg 324 kB/Smin 50 kB→N=12 (or similar message parts)
Fs-1=15

[0134] N<15

[0135] This message is subdivided into 7 parts.

Patent applications in class Authentication of an entity and a message

Patent applications in all subclasses Authentication of an entity and a message